Question 779241
A number rounds to 70. It is an even number. 
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The only whole numbers that round to 70 are

65,66,67,68,69 round up to 70

and

71,72,73,74 round down to 70.
</pre>
The sum of the digits is 9.
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Only one of those has sum of digits 9, and that is 72, sice 7+2=9.

So the answer is 72.

Edwin</pre>